The Real Madrid superstar opened the scoring with a coolly-taken penalty, before adding a second with a speculative long-range drive that was spilled by David de Gea. Both goals were cancelled out by Diego Costa strikes, before Nacho gave Spain the lead.
A clinically precise free-kick from Ronaldo, hammered into the top corner, then rescued Portugal a 3-3 draw late on, sending social media into meltdown.
Yet Twitter was already preoccupied with Ronaldo's first goal, after which he celebrated by stroking his chin following his customary jump and spin in the air.
Indeed, several users have claimed that the gesture was a dig at Ronaldo's eternal rival, Lionel Messi, who has starred in a promotion with a goat for Adidas recently.
The message, of course, is that Messi is the greatest of all time, but the Portugal captain seems to disagree, perhaps imitating the look of a goat by stroking the hair on his chin.
Ronaldo’s chin celebration is basically saying “Messi goat?...not by the hairs on my chinny, chin, chin”— Stretford Post (@StretfordPost) June 16, 2018
Ronaldo stroking his chin because he’s the GOAT 🐐— Wolf (@seb_scully) June 15, 2018
I don't know what Ronaldo stroking his chin whilst celebrating is supposed to emphasize. I'm christening this celebration "The Goat"— Denis McDermott (@DisforDenis) June 15, 2018
Ronaldo tryna tell Messi who's the goat with that celebration?— Bhushan 부샨 (@ithinkmfallin) June 15, 2018
Or perhaps it was a message to De Gea, who has himself grown a beard in recent months and seemed to attempt to put Ronaldo off before he struck the penalty.
I swear this Ronaldo celebration is still making me laugh. Thought he was mocking De Gea for his acrobatic Beard 😂😅😅 pic.twitter.com/QkJTPRVuma— Adele (@_topeh1) June 16, 2018
Superb match this has been so far. Initially I thought Ronaldo's chin rub celebration was to mock Messi the GOAT. But then realized its him taking the piss out of De gea's beard 😂🤣🤣 Whattay guy..😏— SAMPATH🦇 (@trueindiangrit) June 15, 2018
Or maybe, just maybe, Ronaldo was paying tribute to broadcast legend Jimmy Hill...
Nothing but respect for Ronaldo doing the old playground Jimmy Hill in celebration. pic.twitter.com/8pB4hN2MKH— Kelvin Barker (@ChelseaKelv) June 15, 2018
Ronaldo paying tribute to Jimmy Hill with the old "chinny" celebration. Lovely touch.— Simon Lovell (@S14LOV) June 15, 2018
What do you think? Let us know in the comments!